T-MOBILE USA, INC.
40 prefixes in 928 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 928-225 | FLAGSTAFF | 6529 | 2002-01-31 | Yes |
| 928-230 | LKHAVASUCY | 6529 | 2002-09-17 | Yes |
| 928-232 | WICKENBURG | 6529 | 2002-07-03 | Yes |
| 928-237 | PRESCOTT | 6529 | 2002-08-07 | Yes |
| 928-239 | SEDONA | 6529 | 2002-08-07 | Yes |
| 928-246 | YUMA | 6529 | — | Yes |
| 928-250 | SAFFORD | 6529 | 2016-06-09 | Yes |
| 928-256 | YUMA | 6529 | 2016-07-15 | Yes |
| 928-259 | YUMA | 6529 | 2010-03-15 | Yes |
| 928-261 | YUMA | 6529 | — | Yes |
| 928-279 | KINGMAN | 6529 | 2001-03-12 | Yes |
| 928-310 | FLAGSTAFF | 6529 | 2004-09-22 | Yes |
| 928-315 | SOMERTON | 6529 | 2007-09-07 | Yes |
| 928-388 | YUMA | 6529 | — | Yes |
| 928-399 | SEDONA | 6529 | 2002-01-29 | Yes |
| 928-417 | SAFFORD | 6529 | 2021-07-27 | Yes |
| 928-418 | KINGMAN | 6529 | 2021-08-24 | Yes |
| 928-420 | PRESCOTT | 6529 | 2004-09-22 | Yes |
| 928-435 | BULLHEADCY | 6529 | 2022-08-12 | Yes |
| 928-446 | YUMA | 6529 | 2002-01-15 | Yes |
| 928-450 | BULLHEADCY | 6529 | 2021-10-01 | Yes |
| 928-451 | SEDONA | 6529 | 2004-09-22 | Yes |
| 928-458 | PRESCOTT | 6529 | 2002-01-29 | Yes |
| 928-459 | YUMA | 6529 | — | Yes |
| 928-464 | WICKENBURG | 6529 | 2022-01-07 | Yes |
| 928-469 | PARKER | 6529 | 2022-01-07 | Yes |
| 928-486 | LKHAVASUCY | 6529 | 2001-04-16 | Yes |
| 928-488 | YUMA | 6529 | 2006-01-31 | Yes |
| 928-514 | BULLHEADCY | 6529 | 2010-07-23 | Yes |
| 928-518 | SEDONA | 6529 | 2024-02-07 | Yes |
| 928-533 | PRESCOTT | 6529 | 2002-04-17 | Yes |
| 928-542 | BULLHEADCY | 6529 | 2001-08-15 | Yes |
| 928-550 | SOMERTON | 6529 | 2005-06-02 | Yes |
| 928-553 | BULLHEADCY | 6529 | 2025-11-06 | Yes |
| 928-600 | FLAGSTAFF | 6529 | — | Yes |
| 928-710 | PRESCOTT | 6529 | — | Yes |
| 928-848 | PRESCOTT | 6529 | 2002-01-15 | Yes |
| 928-862 | SEDONA | 6529 | 2002-08-28 | Yes |
| 928-863 | FLAGSTAFF | 6529 | 2002-08-28 | Yes |
| 928-941 | YUMA | 6529 | — | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.